More On This...

The singer, who caught an 8:59 PM JetBlue flight to LAX, stopped to take photos with a fan after leaving the bathroom.

"She was really sweet," the fan told FOX411. "[When] she came out of the bathroom, and [I] asked for a pic, she pulled me in close and said, 'For sure.' Then I said, 'Have a safe flight,' and she said...'thank you, it was nice to meet you.'"

Another eyewitness said Grande was "sweet and stopped to take photos with people."

The New York Post reported that the singer's life coach couldn't deal with Grande's behavior and quit. Sources told the Post that the "Problem" singer arrived late to her Marie Claire cover shoot and was a "monster" about her hair and treated everyone poorly.